tests: Fix fs_tests for unknown locales

Fix by removing "L" as suggested by meeDamian in
bitcoin/bitcoin#14948 (comment)

Co-Authored-By: [email protected]

Author: carnhofdaki

src/test/fs_tests.cpp

@@ -15,7 +15,7 @@ BOOST_AUTO_TEST_CASE(fsbridge_fstream)
     fs::path tmpfolder = GetDataDir();
     // tmpfile1 should be the same as tmpfile2
     fs::path tmpfile1 = tmpfolder / "fs_tests_₿_🏃";
-    fs::path tmpfile2 = tmpfolder / L"fs_tests_₿_🏃";
+    fs::path tmpfile2 = tmpfolder / "fs_tests_₿_🏃";
     {
         fsbridge::ofstream file(tmpfile1);
         file << "bitcoin";